Metroid: Hissho Tekunikku Kan Peki-ban

Metroid: Hissho Tekunikku Kan Peki-ban is a manga and strategy guide for the NES game Metroid published in Japan by Tokuma Shoten in 1986. It is issue WC-17 of Wanpakku Comics and volume 10 of the Hissho Tekunikku Kan Peki-ban series. The manga was produced by Minazuki Yuu with help from Izanami Roh and Suzutoh Idzumi and was written as a complete walkthrough for Metroid. It also provides backstory, describes each enemy and power-up, has detailed maps, and reveals secrets and useful strategies, all through a fully-illustrated 192-page comic.

I didn't learn about this comic until 2018, but I was very impressed by it when I saw it. It still amazes me how much work the Japanese put into their video games even as early as 1986. Although the quality belies a manga clearly intended for children, the length of the manga and how closely it ties to the game is mind-blowing.